基于Fluent的管道内水合物浆液流动特性数值模拟

Numerical simulation of hydrate slurry flow characteristics in pipelines based on Fluent

利用ANSYS Fluent 14.0对R11水合物浆液在弯曲管道中的流动情况进行了模拟,考察了水合物颗粒密度和颗粒平均粒径对管路压降梯度和水合物颗粒体积分数分布的影响。结果显示,水合物浆液的压降梯度和颗粒平均尺寸均随着水合物密度的增加而增大,但水合物颗粒粒径的增加使得压降梯度降低。此外,增大水合物颗粒密度和平均粒径均促进了水合物向管壁聚集,出现了较大的体积分数分布梯度。水合物颗粒沉积特性表明,对于体积分数为14%的水合物浆液,当流体速率小于0.40 m/s时,水合物颗粒会沉积在管壁上,引起管道堵塞;当流速为0.10 m/s时,水合物颗粒沉积床层厚度可达14 mm,随着流速的增加,床层高度减小。

Using ANSYS Fluent 14.0,the flow of R11 hydrate slurry in the curved pipe was simulated,and the effects of hydrate particle density and average particle size on pipeline pressure drop gradient and hydrate particle volume fraction distribution were investigated.The results show that the pressure drop gradient and the average particle size of the hydrate slurry increase with the increase of the hydrate density,but the increase of the hydrate particle size causes the pressure drop gradient to decrease.In addition,increasing the density and average particle size of hydrate particles promote the accumulation of hydrates on the tube wall,resulting in a larger volume fraction distribution gradient.The deposition characteristics of hydrate particles show that for a hydrate slurry with a volume fraction of 14%,when the fluid velocity is less than 0.40 m/s,hydrate particles will deposit on the pipe wall,causing the pipeline to block;when the flow velocity is 0.10 m/s,the thickness of the sedimentary bed of hydrate particles can reach 14 mm,and as the flow velocity increases,the height of the bed decreases.